I remember seeing concept artwork, or people just having fun, with "tactical wizards" absolute ages ago and thinking it'd be a neat game. What a pleasant surprise to see it actually is/became one! Good for them, and given how I've enjoyed similar seeming genre indy games like Invisible Inc in the past could be up my alley. However:
I have mixed feelings about it, even for a "small team". But without getting into the often retread platform issues, a bigger sin to me is no GOG version. Having a game like this be Windows only at this point does feel a little archaic vs at least getting it officially tested with stuff like Proton on release, but still picking one OS platform has been a long time thing. But also tying it to one single more locked down distribution platform like Steam is imho not excusable at this point. I don't hate Steam or anything by any means, but in terms of longevity I want single player games like this in particular on GOG so I can download standard zips of them and have them myself forever. That's a real shame and probably enough to put me off of it.